B. There was a low rate of volunteerism
In World War ll there was actually a very high amount of volunteers due to the efforts of President Roosevelt; who made it look like America had a duty to fend for others.<span />
Before the 1800s, builders used cast iron. But they found that structural steel beams set in concrete allowed them to frame tall buildings that were more fire resistant and more structurally sound than cast iron. Since that time, steel has not only become the best building material for commercial construction but closely tied to economic health.
The correct answer is industrialization.
During the early 20th century, industrialization was growing rapidly in America. This meant more factories, consumer goods, and workers needed to produce goods.
Due to industrialization, many American citizens worked in factories for long hours and under unsafe working conditions. American citizens during this time work as many as 60 hours per week and worked 6 days a week. This result of industrialization caught the attention of the Progressive party members, as they wanted to make working conditions better for the average American citizen.
If we are talking about the second world war, then then answer would be that the Chinese kept the Japanese busy fighting them, and in turn, about 800,000 of their troops. This gave the Americans, who were the main force against the Japanese during this time, a little breathing room with which to continue military operations.
Hope this answered your question.
